Burner for heating purposes.



No. 628,160. 7 Patented July 4, I899. F. H. HARRIMAN. BURNER FOR HEATING PURPOSES.

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UNITED STATES PATENT OFFICE.

FRANK H. HARRIMAN, OF MAYNARD, MASSACHUSETTS.

BURNER FOR HEATING PURPOSES.

SPECIFICATION formingpart of Lettersllatent No. 628,160, dated July 4, 1899.

Application filed October 3, 189 8- To all whono it mag concern:

Be it known that I, FRANK H. HARRIMAN,

of Maynard, county of Middlesex, and State of Massachusetts, have invented an Improvement in Burners for Heating Purposes, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to that type of heating-burners wherein a chamber provided with burner-orifices is supplied With a mixture of gas and air under pressure, air-supplying orifices furnishing the air required to support combustion. Burners of this type have been devised heretofore for heating the hollow rolls of ironing-machines, &c., the construction usually comprising two tubes one within the other and so arranged that the air for supporting combustion is delivered in close proximity to the burner-orifices. So far as I am aware none of the burners of this type heretofore devised can be used successfullywith gasolene or other heavy gases," owing-to the fact that the air and gas cannot become so thoroughly mixed as to circulate in and traverse the entire length of the mixing-chamber, which condition must be fulfilled in order to produce a uniform steady flame throughout the length of the chamber provided with burner-orifices.

My present invention has for its object the production of a burner of the type specified which is adapted tobeused with either light or heavy gases, and particularly the latter, such as gasolene and the like.

Figure 1,in elevation and section and broken out to save space, illustrates a burner embodying my invention in position to heatahollow roll, also shown for the most part in section; and Fig. 2 is a transverse section on the line 2 2, Fig. 1.

A hollow roll A, such as may be used in an ironing-machine, has introduced atone end thereof my improved burner, the latter comprising a tube a of suitablelength, closed at its end within the roll A by a plug a and connected at its other end with a union D and an air-.conduitb within the tube a. The union has a suitably-attached valve-case d and valve cl, and a nipple d provides ready means for attaching the pipe (not shown) leading from Serial No. 692,470. (No model.)

the source of air-supply. I have herein shown the union as provided with the gas-inlet G, which communicates with the usual or desired gas-supply, so that the air and gas enter freely the tube a, which Iterm the mixing-chamber. The air and gas can become thoroughly mixed in and circulate to every part of the chamber, which is made of relatively large diameter for this purpose, and on its upper side the wallof the chamber is provided with burner-orifices a. I prefer to make these orifices as fine transverse slots, preferably arranged in groups, as I find that this arrangement and construction produce an even flame of uniform intensity, particularly when heavy gas is used.

The air-conduit b is shown as a tube of very much'smaller diameter than the chamber, extended within the latter and suitably attached to the wall thereof diametrically opposite the burner-apertures a in order to be as far therefrom as possible and to obstruct the interior of the chamber to the least possible extent. A plug b may be used to close the end of the conduit within the chamber; its other end being shown at 1), extended into the union D some distance beyond the gas-inlet G in order that a portion of the air-supply may enter the conduit without any intermixture of gas.

There is no communication whatever between the air-conduit and the interior of the chamber a; but suitable outlets b for the conduit are made through the adjacent wall of the chamber, so that the air from the conduit which is to support combustion passes entirely around the exterior of the chamber before reaching the burner-apertures of the latter.

With the long ironing-rolls now used a burner must often be about four feet in length to properly heat the ro1l,- and with a mixingchamber one inch in diameter and the airconduit one-eighth inch in diameter I by my construction am enabled to use a burner four feet long and to heat a roll uniformly from end to end with any kind of gas with complete success.

I attribute the successful operation of my burner, particularly with gasolene or other heavy gases, to the comparatively large di-' Patent, is

burner-apertures serving to enlarge or spread the fiame, and to the relative location of the burner-apertures and the outlet-apertures for the air-conduit. This latter feature is an important one,t'or the reason that while an abundance of air for combustion is supplied it is not delivered near the burner-apertures, and hence does not operate to blow any unconsumed or partly-consumed mixture of air and gas away from the burn er-apertures.

Having fully described my invention, what I claim as new, and desire to secure by Letters 1. Aburner of theclass described, comprising an elongated mixing-chamber provided with groups of burner-slots, an inclosed airconduit within the chamber and having ontlets through the wall thereof diametrically opposite the burnerslots, and air and gas inlets for the mixing-chamber, the air-conduit opening into said air-inlet at a point beyond the gas -inlet, combined with an inclosing chamber for the burner, substantially as described.

2. A burner of the class described, comprising a long, tubular mixing-chamber provided with slotted burner-apertures, a closure for one end of the chamber, and air and gas inlets at its other end, a tubular air-conduit of relatively small cross -section within said chamber and having outlets through the wall thereof substantially diametrically opposite the burner-apertures, whereby air to support combustion is supplied to the burners at the exterior of the chamber, the air-conduit opening directly into the air-inlet, combined with an inclosing chamber for the burner, subi stantially as described.

3. A burner of the class described, comprising a tubular mixing-chamber of large diameter closed at one end and having air and gas l inlets at the opposite end, the wall of the chamber being provided with groups of trans- 1 verse burner-slots, an air-conduit within and adjacent the diametrically opposite wall of the chamber and non-com mu nicating therewith, the inlet end of the conduit being extended into the main air-inlet, and air-outlets for said conduit distributed throughout the length thereof and communicating with apertures in the chamber-wall, combined with an inclosing chamber for the burner, substantially as described.

4:. A burner of the class described, com prising a long tubular mixing-chamber of large diameter closed at one end, an air-inlet communicating directly with its other end, a gasinlet opening into the air-inlet, an inclosed air-conduit of relatively small diameter within the chamber and extending into the airinlet beyond the gas-inlet, said chamber having groups of burner-apertures in-its wall diametrically opposite the air-conduit, and outlet-orifices in the wall of the chamber communicating with the air-conduit, combined with an inclosing chamber for the burner, substantially as described.

5. Aburnerof the class described, comprising a tubular mixing-chamber of large diam eter having burner-slits in its wall, an inclosed air-conduit of relatively small diameter within and attached to the wall of the chamber diametrically opposite the burnerslits and having outlets through the adjacent wall of the said chamber, a common air-inlet for said chamber and conduit, and a gas-supply inlet for the chamber only, combined with an inclosing chamber for the burner, substantially as described.

In testimony whereof I have signed my 5 name to this specification in the presence of two subscribing witnesses.

FRANK H. HARRIMAN.

\Vitnesses:

GEO. W. GREGORY, ALEX. O. PROUDFIT. 

